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DEFENCE IN DEPTH
Defence in depth: reactors

WHAT SHOULD AFFECT THE RATING?

 

Armed with the concepts of initiators and safety functions, we can come to the methodology for rating.

We saw in the overview module that the rating should consider the three aspects shown here.

For events involving reactors at power, the answer to the first question, "how severe would the accident have been if everything had gone wrong?" is SEVERE! The worst accidents for reactors at power clearly rate at INES Levels 5–7. In other words, we don’t really need to address the question of how severe, as it is always the same.